Tinea Versicolor: Causes, How to Tell It from Vitiligo and Ringworm, and How to Stop It Coming Back
Tinea versicolor (Pityriasis versicolor) is a superficial fungal infection of the outermost layer of the skin. It is caused by Malassezia yeast, which already lives on everyone's normal skin but multiplies abnormally when the skin is hot, damp, sweaty and oily. This produces white, light brown or pink patches with fine, powdery scale, most often on the back, chest, neck, shoulders and upper arms.
Tinea versicolor is not a disease of poor hygiene, it does not spread from person to person, and it is not vitiligo. There is a clear way to treat it, but many people do not finish their medicine, use medicated shampoo the wrong way, or stop early because the pale patches are still there. In this article, a dermatologist explains how it develops, how to tell it apart from similar-looking conditions, each group of medicines with the strength and duration actually used, how to use medicated shampoo so it works, and a plan to keep it from coming back.
What is tinea versicolor, and what really causes it?
Tinea versicolor is caused by yeast of the genus Malassezia. The most common species in Thai patients are Malassezia globosa and Malassezia furfur. These yeasts are part of the normal skin flora of everyone, so you do not catch them from anywhere.
What turns a yeast that sits quietly on the skin into a disease is a change from round yeast cells (yeast form) to threadlike filaments (hyphal form) that invade the stratum corneum. Clear triggers include:
Hot, humid weather — in tropical countries such as Thailand, tinea versicolor is found in as many as about 30–50% of some populations, compared with only 1–4% in cold climates.
Heavy sweating — athletes, people who work outdoors, and people who wear tight or non-breathable clothing all day.
Oily skin and active oil glands — Malassezia feeds on oil, so it favors the back, chest, neck and shoulders, where oil glands are densest.
Age — most common between 15 and 24 years, when hormones stimulate the oil glands the most.
Body conditions — pregnancy, birth control pills, steroid use, poorly controlled diabetes, weakened immunity, malnutrition.
Genetics — in some families many members are affected, not because they pass it to each other, but because they have similar skin type and oil production.
Why the skin changes color is not caused by the organism itself but by substances it makes: the dicarboxylic acids (azelaic acid) produced by Malassezia block the enzyme tyrosinase in pigment cells, so that area “cannot make pigment” and turns into white patches. In some people the organism instead triggers mild inflammation that increases pigment, which appears as brown patches. This explains why pale marks can last for several months even after the organism has died.
What does tinea versicolor look like? Features used to tell it apart
Shape — round or oval patches 0.5–2 centimeters across with fairly clear edges, often merging into large patches with scalloped, map-like borders.
Color — paler than the surrounding skin, light brown, pink or reddish brown. One person may have several colors at once, which is where the name versicolor (many colors) comes from.
Scale — very fine, powdery scale that may be hard to see at a glance. Gently scrape with a fingernail or a slide and the scale falls off clearly. This is called the evoked scale sign or “coup d'ongle”, and it is the best clue for telling it from vitiligo by eye.
Itch — mild or none in most people; it itches more when sweating.
Location — mainly the back, chest, neck, shoulders and upper arms. In children and teenagers it can appear on the face and forehead.
White-patch type (hypopigmented type) — the type most often seen in Thai patients
Appearance — white or cream-colored patches spread over the back and chest, with moderately clear edges and fine scale when scraped. The surrounding skin is normal. It is most visible after sun exposure because the surrounding skin tans but the patches do not.
Cause — dicarboxylic acids from the organism block the enzyme tyrosinase, so the melanocytes in that area temporarily stop making pigment.
Severity/urgency — not dangerous and does not spread to internal organs, but it is the type that takes longest for skin color to recover after treatment, about 1–6 months.
When to see a doctor — when the white patch is numb or has reduced sensation, when the edge of the patch is raised and firm, or when, after 4 weeks of full antifungal treatment, there is still scale and new patches keep appearing.
Brown or red type (hyperpigmented / erythematous type)
Appearance — light brown, gray-brown or pinkish-red patches, usually on the neck, chest and sides of the body. Many patients think it is “dull skin” or “sweat stains” and scrub hard, which only irritates the skin more.
Cause — low-grade inflammation from the organism stimulates melanocytes to make more pigment, together with enlarged pigment cells in the epidermis.
Severity/urgency — not dangerous and usually responds well to topical treatment. The darker color fades after the organism clears, within about 1–3 months, which is faster than the white-patch type.
When to see a doctor — when you cannot tell it apart from pityriasis rosea or a drug rash, or when the rash spreads quickly within a few days, which is not how tinea versicolor behaves.
“Sun tinea” — why it becomes more visible with sun exposure
Appearance — “sun tinea”, as Thai people call it, means the white-patch type of tinea versicolor that becomes much more obvious after sun exposure. It is not a different disease.
Cause — the normal surrounding skin makes more pigment in the sun, but skin with the organism cannot make pigment, so the color difference becomes sharper, like a picture with more contrast. It does not mean the sun makes the organism spread.
Severity/urgency — not urgent, but it is why many people see a doctor at the start of summer or after a beach trip.
When to see a doctor — when, after sun exposure, the patches turn red, sting or blister, which points to a photoallergic reaction or photocontact dermatitis rather than tinea versicolor.
Tinea versicolor on the face and in children
Appearance — in children and young teenagers, tinea versicolor appears on the forehead, cheeks and temples more often than in adults, as faint white patches with fine scale. In young children it sometimes appears in the armpits and groin.
Cause — children have more active oil glands on the face and scalp than on the trunk, together with sweat and outdoor play.
Severity/urgency — not dangerous, but it must be told apart from pityriasis alba, because the two look very similar on a child's cheeks but are treated differently.
When to see a doctor — a child under 2 years with white patches over a wide area, or white patches with no scale at all and very sharp edges, should be examined to rule out vitiligo and other conditions.
Malassezia folliculitis — a relative of tinea versicolor often mistaken for acne
Appearance — small red bumps or pustules, all about the same size (1–3 millimeters), around hair follicles on the back, chest, shoulders and upper arms. It is clearly itchy, and there are no blackheads or whiteheads mixed in.
Cause — the same Malassezia that causes tinea versicolor, but living inside the hair follicle instead of on the surface layer of the skin, which is why it is called Malassezia folliculitis.
Severity/urgency — not dangerous, but the key point is that acne medicines and antibiotics do not help and may make it worse. Many patients apply acne treatment for months without improvement.
When to see a doctor — when “back acne” is very itchy, all the bumps are the same size, and it has not improved after more than 6–8 weeks of acne treatment.
How is tinea versicolor different from ringworm?
In Thailand people often say “klak-kluen” (ringworm and tinea versicolor) in one breath, so many think they are the same disease, but they are different organisms, different medicines and different behavior.
The organism — tinea versicolor is caused by Malassezia yeast that is already on our skin, while ringworm (Tinea corporis) is caused by dermatophyte fungi picked up from outside.
Look of the rash — tinea versicolor is multicolored patches with fine, powdery scale and flat edges. Ringworm is a ring with a clearly raised red edge and a paler center.
Itch — tinea versicolor itches little or not at all; ringworm itches clearly.
Favorite locations — tinea versicolor appears on the back, chest, neck and shoulders. Ringworm appears in the groin, trunk, limbs and between the toes.
Spread — tinea versicolor does not spread from person to person. Ringworm can spread from people, animals and shared items.
Medicines — tinea versicolor is treated with topical azoles, medicated shampoos and oral azoles. Ringworm responds to both azoles and terbinafine.
Oral terbinafine — works well for ringworm but does not work for tinea versicolor.
The last point is a common reason for treatment failure: a patient is given oral terbinafine because of a diagnosis of ringworm and the rash does not improve at all, because the drug reaches the skin in a form that cannot kill Malassezia.
White patches — is it tinea versicolor or vitiligo?
This is the question that worries patients most, because vitiligo is a chronic condition that is much harder to treat. Practical ways to tell them apart:
Color of the patch — tinea versicolor is only slightly paler than the skin and still shows some faint color. Vitiligo is completely white like chalk, with no pigment left.
Scale — tinea versicolor has fine scale when gently scraped. Vitiligo has no scale and the skin is smooth and normal. This is the best clue by eye.
Edge of the patch — tinea versicolor has less sharp edges that blend into the surrounding skin. Vitiligo has sharply defined edges, sometimes darker than normal skin.
Typical location — tinea versicolor appears on the back, chest, neck and shoulders. Vitiligo usually appears around the mouth and eyes, on the hands, feet, elbows, knees and areas of friction.
Hair color in the area — with tinea versicolor the hair is its normal color. With vitiligo the hair may turn white.
Response to antifungal medicine — in tinea versicolor the scale clears within 2–4 weeks. Vitiligo does not change at all.
Read a detailed comparison of the whole group of white-patch conditions at Small, non-itchy white patches on the skin: what causes them?
Other conditions that look like tinea versicolor, and warning signs that need prompt medical attention
Pityriasis alba — faint white patches with unclear edges and fine dry scale, found on the cheeks of children with sensitive skin. It is not a fungus.
Pityriasis rosea — begins with one large patch followed by small rashes arranged along the rib lines. It clears by itself within 6–8 weeks.
Post-inflammatory hypopigmentation — follows a rash, wound or treatment, with a clear history.
Guttate psoriasis — thick silvery scale that leaves tiny bleeding points when scraped.
🔴 Early leprosy (Indeterminate leprosy) — a pale patch that is numb or has reduced sensation, does not sweat, or has a thickened nerve that can be felt nearby. This is a sign to see a doctor, not to buy cream yourself.
Signs that should not wait include a numb patch, a patch with a sore or bleeding, a rash that spreads over the whole body within a few days, fever, or onset in someone with weakened immunity.
How does a doctor diagnose tinea versicolor?
Examination and skin scraping — the doctor gently scrapes the skin with a slide to look for the evoked scale sign, which confirms the diagnosis immediately in many patients.
KOH test (Potassium hydroxide preparation) — scale is mixed with KOH solution and examined under a microscope, showing short filaments mixed with clusters of round spores, described in textbooks as “spaghetti and meatballs”. This test confirms the disease within minutes and is inexpensive.
Wood's lamp — affected areas may glow golden yellow, but this is seen in only about 1 in 3 patients, so it can help confirm the diagnosis but cannot be used to rule it out.
Culture — not needed in practice, because Malassezia needs a special oil-enriched culture medium.
The key point is that no skin biopsy is needed in typical cases. The eye and the microscope are enough to diagnose tinea versicolor.
Topical treatment for tinea versicolor — medicine, strength and actual duration
Topical treatment is the main treatment for almost every patient with tinea versicolor and is enough for most. The evidence-based medicines used in Thailand fall into two approaches.
Group 1 — medicines that remove scale and inhibit the organism (non-specific)
20% Sodium thiosulfate solution — a liquid used for a long time and still the standard formula in Thai government hospitals. Apply to the affected area twice a day for 2–4 weeks. Advantages are low cost and suitability for large areas. Disadvantages are a strong sulfur-like smell and possible irritation of thin skin.
2.5% Selenium sulfide lotion or shampoo — apply, leave on for 10 minutes, then rinse off, once a day for 7–14 days in a row.
Zinc pyrithione 1–2% — useful as an add-on and for prevention.
Group 2 — azole antifungals
Ketoconazole 2% shampoo or cream — the medicine with the most supporting evidence for tinea versicolor. The shampoo is used once a day for 5–7 days, or used once and repeated 1 week later. The cream is applied 1–2 times a day for 2–4 weeks.
Clotrimazole 1% cream — apply twice a day for 2–4 weeks. Suitable for small, limited patches.
Miconazole 2% cream — dose and duration similar to clotrimazole.
Topical terbinafine 1% — works in topical form, but it must be stressed that the oral form does not work for tinea versicolor.
Principles of topical treatment that separate cure from failure
Apply wider than the visible patch, at least 2 centimeters around it, because the organism always extends beyond the visible edge.
Keep applying for the full course even if the scale clears in the first week. Stopping at week 1 is the most common cause of recurrence.
Do not use over-the-counter creams that contain a steroid. Steroids suppress inflammation so it looks better for a while, but they let the organism grow and the rash comes back stronger than before.
For details on choosing among antifungal creams by body area, read Antifungal creams: which one to choose and how many weeks until it really clears
How to use medicated shampoo so it really works — the step people get wrong most often
Medicated shampoo is the most suitable form for tinea versicolor, because it often covers an area too large for cream. But most people use it like soap, lathering and rinsing straight away, so the medicine barely touches the skin long enough.
Wet the skin first with slightly warm water. No need to wash with soap beforehand.
Pour the medicated shampoo into your palm and apply it directly to the affected skin — do not wash your hair and let the foam run down your body.
Cover the whole back, chest, neck, shoulders and upper arms, even areas where no rash is visible yet, because the organism lives throughout the oily zones.
Leave on for 5 minutes for ketoconazole 2% or 10 minutes for selenium sulfide 2.5%. Use a real timer, do not guess.
Rinse off thoroughly and pat the skin completely dry, especially under the breasts and in skin folds.
Repeat as the doctor directs. Generally once a day for 5–7 days during treatment, then reduced to once a week during prevention.
Step 4 is what decides between “it worked” and “it did nothing”, because these medicines need contact time to penetrate the stratum corneum.
Oral medicines — when used, what dose, and which ones cannot be used
Oral medicines are not the first choice. A doctor considers them if any one of these applies: the area is so large that cream cannot cover it, the full topical plan has not worked, it recurs several times a year, or the patient has limitations that make applying the medicine impossible.
Itraconazole — a commonly used dose is 200 milligrams a day for 5–7 days, taken with food to improve absorption.
Fluconazole — a commonly used dose is 300 milligrams once a week for 2 weeks.
Those you need to know cannot be used
Oral ketoconazole — no longer used for tinea versicolor, because the risk of severe liver inflammation outweighs the benefit. The topical and shampoo forms remain safe and are the mainstay.
Oral terbinafine — does not work for tinea versicolor, even though it works very well for ringworm and nail fungus.
What to watch for with oral medicine is drug interactions. Azoles interfere with several liver enzymes, so caution is needed with some cholesterol medicines, blood thinners and certain heart medicines, and they must not be used in pregnancy. For this reason the choice of oral medicine, dose and duration must be the doctor's decision after reviewing all medicines and underlying conditions, not something to buy and take on your own.
How do you know treatment is working, and how do you know it is not?
This is the most misunderstood point, because patients use “skin color” as the measure when they should use “scale”.
Signs it is working
Scale clears within 2–3 weeks; scraping gives no falling scale.
No new patches appear after week 2.
Itch decreases until it is gone.
A repeat KOH test shows no organism.
Signs it is not working — go back to the doctor
Scale can still be scraped after 4 full weeks of treatment.
New patches appear during treatment.
The rash becomes red, stings or itches more after applying medicine, which may be contact allergy to the medicine.
It returns within 1 month after stopping treatment.
What is not a sign of failure is white or brown marks that remain. That is a matter of pigment, not of the organism.
Why do the white patches not go away after treatment?
Because antifungal medicine kills the organism but does not put pigment back. After the organism dies, the pigment cells need time to recover and make new pigment. Typical timelines are:
The brown or red type normally fades within about 1–3 months.
The white-patch type takes longer, about 1–6 months, and in some people who have had it for many years it may take up to 12 months.
What helps color return faster is gentle morning sun exposure, done regularly and safely, together with keeping the skin from drying out. What does not help, and is often bought for self-treatment, is strong exfoliating creams, creams advertised to even out skin tone, and scrubbing the area, which irritate the skin and leave the marks for longer.
If, after 6 months, the white marks have not faded at all and scraping gives no scale, see a doctor to review the diagnosis.
Why does tinea versicolor come back, and a year-round prevention plan
Tinea versicolor recurs very often. Follow-up data show a recurrence rate of about 60–80% within 2 years without continued prevention. The straightforward reason is that this organism lives on our skin for life. Treatment reduces its numbers back to a balance; it does not eliminate it.
During treatment, weeks 1–4 — use the topical medicine or medicated shampoo as planned to the end, and do not stop when the scale clears.
After clearing, months 1–6 — use ketoconazole 2% or selenium sulfide 2.5% shampoo once a week.
Every hot and rainy season — increase to twice a week during months of heavy sweating.
Every day — shower and change clothes right after sweating, pat the skin completely dry, and choose breathable clothing.
What to avoid — heavy creams and oils on the back and chest, because oil is direct food for the organism.
For people who relapse more than 2–3 times a year, a doctor may consider a preventive medicine plan tailored to the individual, which must be weighed against side effects and underlying conditions case by case.
Is tinea versicolor contagious, and is it about cleanliness?
In practice it does not spread from person to person, because the organism that causes it is a resident of everyone's skin already. Sleeping in the same bed, sharing a bathroom, swimming in the same pool or hugging does not cause tinea versicolor. What makes several people in one home have it at the same time is living in the same climate and having similar skin type.
And it has nothing to do with poor hygiene. People who shower three times a day can get tinea versicolor if they sweat a lot and have oily skin. On the other hand, scrubbing the skin hard to “clean” it inflames the skin and makes the marks last longer.
Washing clothes and towels in hot water and drying them in the sun is a good general hygiene habit and reduces dampness, but it is not a treatment and not a way to prevent spread, because there is no spread to prevent.
When should you see a dermatologist?
You have used over-the-counter topical medicine for a full 4 weeks and there is still scale and new patches.
You cannot tell whether it is tinea versicolor or vitiligo, especially when the patches are completely white with no scale.
🔴 A patch of skin that is numb or has reduced sensation.
It recurs more than 2–3 times a year and affects your quality of life.
It covers a very wide area, or appears on the face and you are worried about marks.
You have an underlying condition that weakens immunity, poorly controlled diabetes, or you are taking immunosuppressive medicine.
You are pregnant or breastfeeding, when the choice of medicines is limited.
It occurs in a child under 2 years.
For an overview of fungal and infectious skin diseases as a whole, read Fungal and infectious skin diseases, and see all skin condition topics at All skin condition articles
Quick summary
Tinea versicolor is not an outside infection and is not contagious. It is the Malassezia yeast already on our skin, multiplying when it is hot, damp and oily.
The clue to tell it from vitiligo by eye is scale. Gently scrape and fine scale falls off: that is tinea versicolor. If it is completely white and smooth with no scale, a doctor must examine it.
The main medicines are topical treatments and medicated shampoos. 20% sodium thiosulfate twice a day for 2–4 weeks, or ketoconazole 2%, with the shampoo left on for 5 minutes before rinsing, not lathered and rinsed straight away.
Oral medicine is for people with wide or recurrent disease and is the doctor's decision. Oral terbinafine and oral ketoconazole cannot be used for this disease.
Remaining white marks do not mean the organism is still there. Color takes 1–6 months to recover. The measure of success is that the scale is gone, not that the color is back.
What to do after it clears is prevention. Use medicated shampoo once a week, because the chance of recurrence is as high as 60–80% in 2 years without prevention.
The warning sign that needs a doctor right away is a numb patch, because that is not tinea versicolor.
Frequently asked questions about tinea versicolor
Does tinea versicolor go away by itself without treatment?
Generally no. The factors that let the organism grow, hot humid weather, sweat and oily skin, are always present here. The rash may look fainter in cool weather or when you sweat less, then become obvious again when summer arrives. Importantly, leaving it for a long time makes the area of damaged pigment wider and the color takes longer to recover. Treatment with topical medicine or medicated shampoo takes only 2–4 weeks and is inexpensive, so there is no reason to wait for it to go away by itself.
What is the fastest way to treat tinea versicolor?
In practice the fastest way is to use ketoconazole 2% medicated shampoo over the whole back, chest, neck and shoulders on wet skin, leave it on for 5 minutes and rinse off, once a day for 5–7 days in a row, together with an antifungal cream on the thicker patches. What slows it down is not the medicine but applying too narrowly around the visible patch, rinsing too quickly, and stopping the moment the scale clears. Oral medicine, although the course is shorter, does not make “skin color return faster” and carries cautions about the liver and drug interactions, so a doctor must assess it.
Is tinea versicolor contagious? Can you catch it by sleeping in the same bed?
No. The organism that causes tinea versicolor is a yeast that lives on the skin of everyone normally, not something received from another person. Sleeping in the same bed, sharing towels, swimming in the same pool or touching directly does not cause it. The reason people in one home often have it at the same time is that everyone lives in the same hot, humid air and often has similar oily skin by inheritance. There is no need to separate belongings or to worry about passing it to a child or partner.
I was treated, so why do I still have white patches? How many months until they go?
Because antifungal medicine removes the organism but does not put pigment back. After the organism dies, the pigment cells that were suppressed need time to recover. Generally, brown patches fade to normal in 1–3 months, while white patches take about 1–6 months, and in people who have had it for many years it may take up to a year. The measure that the disease is gone is that scraping gives no scale and no new patches appear, not an even skin color. While waiting, avoid scrubbing and strong exfoliating creams because they irritate the skin and make the marks last longer.
How is tinea versicolor different from ringworm? Can I tell myself?
Quite a lot of the time, yes. Ringworm is a ring with a clearly raised red edge and a paler center, clearly itchy, and likes the groin, trunk or between the toes. Tinea versicolor is multicolored patches with flat edges, fine powdery scale, little or no itch, and likes the back, chest, neck and shoulders. A more important difference than the look is the medicine, especially oral terbinafine, which works well for ringworm but does not work for tinea versicolor at all. If you have used medicine for 3–4 weeks with no improvement, have a doctor do a KOH scraping test to confirm which organism it is.
What is “sun tinea”, and why does it show more the more sun you get?
“Sun tinea” is not a different disease from tinea versicolor. It is the term Thai people use for the white-patch type of tinea versicolor that becomes more obvious after sun exposure. The reason is that the normal skin around it makes more pigment in sunlight, while the skin with the organism is blocked from making pigment, so the color difference stands out. It does not mean the sun makes the organism spread. Treatment is the same as for ordinary tinea versicolor, and after the organism has cleared, regular gentle sun exposure actually helps pigment return faster. Strong, prolonged sun exposure does not help and adds other risks.
Written by Dr. Patara Voravutinon, Dermatologist · Last reviewed September 13, 2026
Comments